Selasa, 25 Mei 2010

TREATMENT TECHNIQUES DIGITAL DATA

ERMAPPER is one of the software (software) used to process data or satellite image data. Pengolahan data citra merupakan suatu cara memanipulasi data citra atau mengolah suatu data citra menjadi suatu keluaran (output) yang sesuai dengan yang kita harapkan. Image data processing is a way to manipulate image data or processing an image into an output data (output) that corresponds to what we expect. Adapun cara pengolahan data citra itu sendiri melalui beberapa tahapan, sampai menjadi suatu keluaran yang diharapkan. The way of processing image data itself through several stages, until it becomes an output which is expected. Tujuan dari pengolahan citra adalah mempertajam data geografis dalam bentuk digital menjadi suatu tampilan yang lebih berarti bagi pengguna, dapat memberikan informasi kuantitatif suatu obyek, serta dapat memecahkan masalah. The aim is to sharpen the image processing geographic data in digital form into a view that is more meaningful to users, can provide quantitative information of an object, and can solve the problem.

Data disital disimpan dalam bentuk barisan kotak kecil dua dimensi yang dikenal dengan sebutan pixel (picture element). Disital data are stored in the form of the two-dimensional rows of small boxes, known as pixels (picture element). Masing-masing pixel ini mewakili suatu wilayah yang ada dipermukaan bumi. Each pixel represents an area of the existing ground surface. Struktur ini disebut raster, sehingga data citra sering juga disebut data raster. This structure is called the raster, so that image data is often also called raster data.

Data yang diperoleh dari satelit umumnya terdiri daribeberapa bands (layers) yang mencakup wilayah yang sama. Data obtained from satellites are generally composed daribeberapa bands (layers) that covers the same territory. Masing-masing bands ini mencatat pantulan obyek dari permukaan bumi pada panjang gelombang yang berbeda. Each of these bands recorded the reflection of objects from the earth's surface at different wavelengths. Satellite remote sensing can be differentiated based on Satellite remote sensing Can be differentiated based on

jenis gelombang mikro yang digunakan, yaitu sistem type of microwave used, namely systems type of microwave used, namely type of microwave systems Used, namely systems

pasif (optik) dan sistem aktif (radar). passive (optical) and an active system (radar). passive (optical) and an active system (radar). passive (optical) and an active system (radar). Pada sistem pasif, sensor In passive systems, sensors In passive systems, sensors In passive systems, sensors

merekam objek (permukaan bumi) yang mendapat sinar record object (the earth's surface) that receive light record object (the earth's surface), which got record-ray object (the earth's surface) That the receive light

matahari sebagai sumber energi, sehingga kualitas citra sun as an energy source, so the image quality sun as an energy source, so the image quality of the sun as an energy source, so the image quality

bergantung pada intensitas sinar matahari. depends on the intensity of sunlight. depends on the intensity of sunlight. depends on the intensity of Sunlight. Apabila objek If the object If the object if the object

tertutup awan maka objek tidak terlihat atau tidak tergambarkan. cloud over the object is not visible or not described. cloud over the object is not visible or not described. cloud over the object is not visible or not described.

Pada sistem aktif, sensor merekam objek menggunakan In active systems, sensors record the objects using In active systems, sensors record the object using the In active systems, sensors record the objects using

energi elektromagnetik buatan yang dipancarkan artificial electromagnetic energy emitted artificial electromagnetic energy emitted by the energy emitted electromagnetic artificial

dari sensor dan kemudian diterima kembali oleh antena from sensors and then received back by antenna from sensors and then received back by the antenna from sensors and then back by antenna Received

(Wahyunto et al., 1998). (Wahyunto et al., 1998). (Wahyunto et al., 1998). (Wahyunto et al., 1998). Energi elektromagnetik tersebut The electromagnetic energy The electromagnetic energy is electromagnetic energy

berupa gelombang pendek (microwave) dengan panjang the form of short wave (microwave) with a length the form of short wave (microwave) with the long form of short-wave (microwave) with a length

gelombang bervariasi (2,60-30 cm) atau X, C, S, L-band dan waves (2.60 to 30 cm) or X, C, S, L-band and waves (2.60 to 30 cm) or X, C, S, L-band and waves (2.60 to 30 cm) or X, C, S, L-band and

mempunyai kemampuan menembus awan, sehingga tidak has the ability to penetrate clouds, so no have the ability to penetrate clouds, so it does not has the ABILITY to penetrate Clouds, so no

terpengaruh cahaya matahari dan dapat bekerja siang malam affected by sunlight and can work day and night affected by sunlight and can work day and night Affected by Sunlight and cans work day and night

(Lillesand dan Keifer, 1994). (Lillesand and Keifer, 1994). (Lillesand and Keifer, 1994). (Lillesand and Keifer, 1994).

Satelit Adeos milik Jepang yang telah diluncurkan Japan's Adeos satellite has been launched Adeos satellite owned by Japan which has launched Japan's Adeos satellite has been launched

membawa dua sensor (optik dan radar) sekaligus dalam carries two sensors (optical and radar) as well as in carries two sensors (optical and radar) as well as in carries two sensors (optical and radar) as well as in

perekamannya. the recording. the recording. Dengan demikian, citra satelit Adeos sangat Thus, satellite imagery is very Adeos the recording. As such, highly Thus Adeos satellite imagery, satellite imagery is very Adeos

berguna untuk mengkaji sumber daya alam daratan dan useful to study the land and natural resources useful to study the natural resources of land and useful to study the land and natural resources

lautan karena keduanya saling melengkapi (Nasda, 2000). the oceans because they are complementary (Nasda, 2000). the oceans because they are complementary (Nasda, 2000). Because they want the oceans are complementary (Nasda, 2000).

Untuk dapat memberikan informasi yang benar, baik To be able to provide correct information, either To be able to provide true, either To be Able to Provide correct information, either

jenis informasi maupun skalanya, rekaman citra satelit Adeos types of information as well as its scale, recording Adeos satellite imagery types of information as well as its scale, recording satellite Adeos types of information as well as its scale, recording Adeos satellite imagery

perlu diperbaiki. needs to be improved. needs to be improved. needs to be improved. Perbaikan citra mencakup koreksi Improvements include image correction Improvements include the correction of image improvement include image correction

radiometrik dan geometrik. Koreksi radiometrik dilakukan radiometric and geometric. radiometric and geometric. radiometric correction performed radiometric and geometric. radiometric correction performed radiometric correction Performed

karena adanya efek atmosferik yang mengakibatkan due to atmospheric effects resulting due to atmospheric effects that resulted due to atmospheric effects resulting

kenampakan bumi tidak selalu tajam. appearance of the earth is not always sharp. appearance of the earth is not always sharp. appearance of the earth is not always sharp. Sedangkan koreksi While corrections While corrections Corrections While

geometrik merupakan upaya memperbaiki citra dari pengaruh Geometric is an effort to improve the image of the influence Geometric is an effort to improve the image of Geometric effect is an effort to improve the image of the influences

kelengkungan bumi dan gerakan muka bumi dengan cara curvature of the earth and the earth movement in a way curvature of the earth and the earth motion by curvature of the earth And The earth movement in a way

menyesuaikannya dengan koordinat bumi (memposisikan adapt them to the earth coordinates (positions adapt them to the coordinates of the earth (Them customary position to the earth coordinates (positions

letak lintang dan bujur), sehingga sesuai dengan koordinat where the latitude and longitude), so according to the coordinates where the latitude and longitude), so in accordance with the coordinates of latitude and longitude Nowhere), so according to the coordinates

peta dunia. world map. world map. world map.

Tulisan ini menjelaskan proses perbaikan data digital This paper describes the repair process of digital data This paper describes the repair process of digital data This paper describes the repair process of digital data

dari data optik citra satelit Adeos. from optical data Adeos satellite imagery. from optical data Adeos satellite imagery. Adeos data from optical satellite imagery. Perbaikan mencakup Improvements include Improvements include improvements include

koreksi radiometrik (penajaman citra) dengan teknik radiometric correction (image sharpening) technique radiometric correction (image sharpening) technique with radiometric correction (image sharpening) technique

Gaussian equalize dan koreksi geometrik image to image. Gaussian equalize and image to image geometric correction. Gaussian equalize and image to image geometric correction. Gaussian equalize and image to image geometric correction.

Tidak ada komentar:

Posting Komentar